Dual-energy water heating device and control system thereof

Abstract

The invention belongs to the technical field of water heating devices, discloses a dual-energy water heating device and a control system thereof, and is used for solving the problems that an existing dual-energy water heating device combining gas heating and heat pump heating is low in heat exchange efficiency, too complex to control and not high in intelligence. The dual-energy water heating device is provided with the gas heating system and the heat pump heating system which are independent, two sets of independent heat exchange systems are arranged, the two heating systems do not interfere with each other, independent or combined heating can be achieved, operation control over the dual heating systems is simpler, and the energy consumption is reduced. The two sets of heat exchange systems are adopted for respective heat exchange, so that long-acting work of the heat exchange systems can be guaranteed, and the heat exchange efficiency of different heat exchange systems in different heating systems can be improved; according to the control method for the dual-energy water heating device, different requirements of users and external environment conditions can be responded, and the dual-energy water heating device is automatically controlled to operate in the most suitable heating mode.

Description

Technical Field

[0001] The invention belongs to the technical field of water heaters, and in particular, relates to a dual-energy water heater and a control system thereof. Background Art

[0002] Hot water devices are household appliances commonly used in people's daily lives. In the field of traditional hot water devices, electric water heaters and gas water heaters are the most widely used. However, with the continuous progress of society and the continuous development of science and technology, more and more new energy water heaters are created. Among them, the most efficient are solar water heaters and air-energy water heaters. Both types of water heaters use nature's own energy to generate heat, which is not only energy-saving and environmentally friendly, but also more in line with China's concept of sustainable development.

[0003] In recent years, since single-energy water heating devices have certain shortcomings, dual-energy water heating devices that combine two different energy heating systems have emerged, such as a dual-energy water heater combining wind energy and solar energy disclosed in patent application number "CN200920253664.3", and a dual-energy water heater combining solar energy and air energy disclosed in patent application number "CN201721591231.X".

[0004] Dual-energy water heaters that combine gas water heaters with air-energy water heaters (i.e., heat pump water heaters) have also appeared. However, at present, this type of water heater generally shares a heat exchange system, and its working principle is: water is circulated to the heat exchange system through a water tank, and the circulating water exchanges heat with the heating heat of the dual-energy heating system in the heat exchange system, such as the dual-energy water heater disclosed in the patent application number "CN202011414397.0". Such a structure will certainly make the overall structure of the device simpler and smaller in size, but the two heating systems sharing a heat exchange system are more likely to cause overload of the heat exchange system and low heat exchange efficiency, and the control switching of the heating system will also be more complicated; on the other hand, the current research on dual-energy water heaters is more inclined to the working combination between two hot water systems that use different energy sources for heating, and there are not many relatively integrated integrated water heater products, because the dual-energy water heater system involves many local components. If various constraints are taken into account, it is difficult to integrate the local components and reasonably assemble them into an integrated device.

[0005] In addition, the current dual-energy water heating device control system that combines a gas water heater with a heat pump water heater often has problems with complexity and lack of intelligence in its control methods. It is unable to automatically select the optimal heating mode based on the user's actual needs, resulting in a poor user experience and difficulty in fully leveraging the advantages of the dual-energy water heating device. Summary of the invention

[0006] One of the purposes of the present invention is to provide a dual-energy water heater, which is used to solve the problems of low overall heat exchange efficiency and overly complicated heating control of the existing dual-energy water heaters which use a combination of gas and heat pumps for heating.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The dual energy water heating device comprises a gas heating system, a heat pump heating system, a water tank and a control system. The water tank is provided with a cold water inlet and a hot water outlet. The characteristics are:

[0009] The gas heating system comprises a combustion unit and a gas heating heat exchange pipe, wherein the combustion unit is installed above the water tank, the gas heating heat exchange pipe is installed in the water tank, and one end of the gas heating heat exchange pipe is connected to the combustion unit, and one end of the gas heating heat exchange pipe is connected to a flue gas exhaust pipe;

[0010] The heat pump heating system comprises a compressor, a heat pump heating heat exchanger and an evaporator, wherein the compressor, the heat pump heating heat exchanger and the evaporator are cyclically connected in sequence and integratedly installed on the outside of the water tank;

[0011] The water tank is also provided with a heat pump heating cycle water outlet and a heat pump heating cycle water return port, and the heat pump heating cycle water outlet and the heat pump heating cycle water return port are respectively connected to the heat exchange cycle interface on the heat pump heating heat exchanger; the upper and lower parts of the water tank are respectively provided with temperature sensors for obtaining the actual water temperature of the upper and lower parts of the water tank.

[0012] As a further preferred embodiment of the present technical solution, the gas heating heat exchange tube includes a vertically arranged main heat exchange tube, a secondary circulation heat exchange tube and a flue gas condensation tube, a flue gas diversion chamber is arranged above the water tank, and a flue gas condensation chamber is arranged below the water tank; the upper end of the main heat exchange tube is connected to the combustion unit, the lower end of the main heat exchange tube extends to the bottom of the water tank and is connected to the lower end of the secondary circulation heat exchange tube, and the upper end of the secondary circulation heat exchange tube is connected to the flue gas diversion chamber; the two ends of the flue gas condensation tube are respectively connected to the flue gas diversion chamber and the flue gas condensation chamber; the lower end of the flue gas condensation chamber is connected to the flue gas exhaust pipe.

[0013] As a further preferred embodiment of the present technical solution, the medium outlet end of the compressor is connected to the heat pump heating heat exchanger and the evaporator through a four-way valve; a circulating pump is provided on the connecting pipe between the heat pump heating heat exchanger and the heat pump heating circulation water outlet, and an expansion valve is provided on the connecting pipe between the heat pump heating heat exchanger and the evaporator.

[0014] As a further preferred embodiment of the present technical solution, an outer tube is further provided outside the water tank, and a mounting top cover is connected to the upper end of the outer tube. The mounting top cover is arranged above the combustion unit, and an air supply pipe of the combustion unit passes through the mounting top cover; heat dissipation holes for heat dissipation of the combustion unit are also provided on the mounting top cover; and a closed base is connected to the bottom of the outer tube.

[0015] As a further preferred embodiment of the present technical solution, the compressor, heat pump heating heat exchanger and evaporator are fixedly attached to the outer wall of the outer cylinder through a mounting frame, and the side of the mounting frame connected to the outer cylinder is open; a plurality of horizontal partitions are arranged at upper and lower intervals in the mounting frame, and the plurality of horizontal partitions form correspondingly multiple layers of installation space in the mounting frame, and the compressor, heat pump heating heat exchanger and evaporator are respectively installed in a separate layer of the installation space.

[0016] As a further preferred embodiment of the present technical solution, the horizontal partition includes a first partition, a second partition and a third partition installed in sequence from top to bottom, the first partition and the mounting frame form a first installation space for accommodating the air supply pipe end of the combustion unit, the position of the first installation space corresponds to the mounting top cover, and a combustion air inlet is opened on the mounting frame corresponding to the first installation space area; the first partition, the second partition and the mounting frame form a second installation space for accommodating the evaporator, and a heat pump air inlet is opened on the mounting frame corresponding to the second installation space area; the second partition, the third partition and the mounting frame form a third installation space for accommodating the heat pump heating exchanger; the third partition and the mounting frame form a fourth installation space for installing the compressor.

[0017] As a further preferred embodiment of the present technical solution, the lower end surface of the closed base is flush with the lower end surface of the mounting frame, and at least two load-bearing and limiting beams parallel to each other and spaced apart are fixedly mounted on the bottom of the closed base and the mounting frame.

[0018] Another object of the present invention is to provide a control system based on the above-mentioned dual-energy water heating device, which can automatically optimize the dual-energy heating mode and operation mode according to user needs and environmental conditions to achieve the effect of meeting user needs, reducing energy consumption and reducing carbon emissions.

[0019] To achieve the above object, the present invention provides the following technical solutions:

[0020] The dual energy water heater control system used to control the dual energy water heater is characterized by comprising:

[0021] A control panel, used to receive the desired water temperature Ts and the operation mode selection input by the user, wherein the operation modes include at least a comfort mode, an economic mode and a low-carbon mode; a temperature acquisition module, used to respectively acquire the actual temperature Tu of the upper part of the water tank, the actual temperature Td of the lower part of the water tank, the gas heating hysteresis temperature Ta and the heat pump heating hysteresis temperature Tb;

[0022] The controller is connected to the control panel, the temperature acquisition module, the gas heating system and the heat pump heating system respectively, and is configured as follows:

[0023] When the user selects the comfort mode with the goal of meeting a large demand for hot water, the controller continuously acquires the temperature data transmitted by the temperature acquisition module; when Td≤Ts-Tb, the controller controls the heat pump heating system to start heating the water tank until Td≥Ts, at which time the controller controls the heat pump heating system to shut down and continues to acquire the temperature data; when Tu≤Ts-Ta, the controller controls the gas heating system to start heating the water tank until Tu≥Ts, at which time the controller controls the gas heating system to shut down and continues to acquire the temperature data.

[0024] As a further preferred embodiment of the present technical solution, an economic parameter acquisition module is further included, which is connected to the controller and is used to obtain the unit price of electricity C1, the unit price of natural gas C2 and the current ambient temperature T1 in the current period, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system;

[0025] The controller is also configured to select the economic mode when the user aims to minimize energy costs and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×C1 / C2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2;

[0026] When T1>T2 when the economic mode is started, the controller controls the heat pump heating system to start water tank heating, until T1≤T2-β, the controller controls the heat pump heating system to shut down and controls the gas heating system to start water tank heating, until T1>T2, and this step is repeated; wherein β is the ambient temperature adjustment parameter; when T1≤T2 when the economic mode is started, the controller controls the gas heating system to start water tank heating, until T1≥T2+β, the controller controls the gas heating system to shut down and controls the heat pump heating system to start water tank heating, until T1≤T2, and this step is repeated.

[0027] As a further preferred embodiment of the present technical solution, an economic parameter acquisition module is further included, which is connected to the controller and is used to obtain the carbon emission factor P1 of electricity, the carbon emission factor P2 of natural gas and the current ambient temperature T1, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system;

[0028] The controller is also configured to select the low carbon mode when the user aims to minimize carbon emissions and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×P1 / P2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2;

[0029] When T1>T2 when the low-carbon mode is started, the controller controls the heat pump heating system to start water tank heating, until T1≤T2-β, the controller controls the heat pump heating system to shut down and controls the gas heating system to start water tank heating, until T1>T2, and this step is repeated; wherein β is the ambient temperature adjustment parameter; when T1≤T2 when the low-carbon mode is started, the controller controls the gas heating system to start water tank heating, until T1≥T2+β, the controller controls the gas heating system to shut down and controls the heat pump heating system to start water tank heating, until T1≤T2, and this step is repeated.

[0030] As a further preference of the present technical solution, it also includes a fault detection module, which is configured to continuously detect whether there is a fault in the heat pump heating system or the gas heating system during the process of the heat pump heating system or the gas heating system heating the water tank. If so, a shutdown command is sent to the controller to shut down the heat pump heating system or the gas heating system, and an alarm is given to the user.

[0031] As a further optimization of the present technical solution, the controller is equipped with a gas heating system start-up temperature Tc and a gas heating system shut-down temperature Te. When T1>T2 and Tu≤Tc, the controller controls the gas heating system to start water tank heating until Tu≥Te; wherein 30℃≤Tc≤55℃, 35℃≤Te≤60℃, Te>Tc.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The dual-energy water heating device in the present invention is provided with a separate gas heating system and a heat pump heating system, and two independent heat exchange systems are provided according to the different heating principles of the two heating systems. Among them, the gas heating system has a high instantaneous heating amount and a fast heating rate, so the gas heating heat exchange pipe is directly arranged in the water tank to ensure the maximum heat exchange efficiency, which can be used for rapid heating and reheating; on the other hand, the heat pump heating system adopts an external method, and the water in the water tank can circulate through the heat pump heating heat exchanger through the heat pump heating circulation outlet to realize heat pump heat exchange. Since the heat exchange continuity of the heat pump heating system is strong and the heating cost is low, it can be used for heat preservation energy consumption or hot water circulation. The two heating systems do not interfere with each other, and can realize separate heating or combined heating. The operation control of the dual heating system is simpler, and the use of two sets of heat exchange systems for respective heat exchange can not only ensure the long-term operation of the heat exchange system, but also improve the heat exchange efficiency of different heat exchange systems in different heating systems.

[0034] 2. The gas heating system of the present invention adopts an upward combustion method. The hot flue gas generated by the combustion of the combustion unit first flows from the upper part of the water tank to the bottom of the water tank through the main heat exchange pipe to realize the first heat exchange, and then flows from the bottom of the water tank to the upper part of the water tank through the secondary circulation heat exchange pipe and enters the flue gas diversion chamber to realize the secondary heat exchange. At this time, the flue gas with residual heat flows from the upper part of the water tank to the lower part of the water tank through the flue gas condensation pipe again and enters the flue gas condensation chamber to realize the second heat exchange. Finally, the flue gas that has completed the heat exchange is discharged through the flue gas exhaust pipe. The gas heating system can realize three-way heat exchange between combustion heat and stored water, so that the two can be fully exchanged with each other, which can improve the heat exchange efficiency while reducing heat loss and reducing resource waste.

[0035] 3. The heat pump heating system in the present invention integrates the compressor, heat pump heating heat exchanger and evaporator through a mounting frame, and also arranges a plurality of partitions in the mounting frame to form a corresponding multi-layer mounting space for the separate assembly of each component, which not only achieves the integration and unification of all components in the mounting frame, improves the structural integration of the heat pump heating system, and is conducive to the standardization and productization of the overall dual-energy water heating device, but also the layered installation can realize modular assembly in different installation spaces, which improves the assembly efficiency and is also more convenient for the systematic management and maintenance of each modular component; on the other hand, the heat pump heating system is installed externally on the water tank, which makes the overall device more integrated and more beautiful in appearance.

[0036] 4. A load-bearing limit beam is arranged at the lower part of the dual-energy water heating device in the present invention, which is fixedly connected to the closed base and the bottom of the mounting frame. The load-bearing limit beam has a linear load-bearing surface, and has a stronger load-bearing capacity than the point-like load-bearing of the traditional support base, and is safer and more reliable for large equipment such as the dual-energy water heating device; secondly, there are at least two load-bearing limit beams, and the multiple load-bearing limit beams are parallel to each other and spaced apart. When the whole machine needs to be transported and transferred, the spacing between the load-bearing limit beams can be used as the insertion space for the forklift fork, and then the forklift machinery can be used to transport and transfer the whole machine. Compared with the traditional lifting and transfer method, it is faster and safer, and less likely to damage the equipment.

[0037] 5. The dual-energy water heater control system in the present invention can respond to different needs of users and external environmental conditions, and automatically control the dual-energy water heater to operate in the most suitable heating mode; and in different operating modes, dynamically adjust the use ratio of gas and heat pump to ensure that while meeting user needs, the overall energy efficiency of the system is maximized; Overall, the dual-energy water heater control system in the present invention not only effectively reduces the total energy consumption, but also significantly reduces the user's usage cost and avoids unnecessary energy waste, thereby achieving a more economical and environmentally friendly hot water supply, and improving energy utilization efficiency and reducing environmental burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 It is a schematic diagram of the overall structure of the dual energy water heating device in the present invention;

[0040] Figure 2 for Figure 1 Front projection view of

[0041] Figure 3 It is a schematic diagram of part of the internal structure of the dual-energy water heating device of the present invention;

[0042] Figure 4 It is a cross-sectional view of the internal structure of the gas heating system of the present invention;

[0043] Figure 5 It is a schematic diagram of the internal structure of the heat pump heating system of the present invention;

[0044] Figure 6 It is a schematic diagram of the working principle of the dual energy water heater of the present invention when providing heat;

[0045] Figure 7It is a schematic diagram of the working principle of the dual-energy water heating device in the present invention during defrosting.

[0046] Figure 8 It is a structural schematic diagram of the control system of the dual energy water heater in the present invention;

[0047] Fig. 9 It is a flow chart of a control method of a dual-energy water heater control system in a comfort mode in the present invention;

[0048] Fig.10 It is a flow chart of a control method of a dual-energy water heater control system in an economic mode in the present invention;

[0049] Fig.11 It is a flow chart of a control method of a dual-energy water heater control system in a low-carbon mode in the present invention;

[0050] Fig.12 A heat pump performance curve diagram of a dual-energy water heating device provided in a preferred embodiment of the present invention;

[0051] Among them, 1-water tank, 2-cold water inlet, 3-hot water outlet, 4-combustion unit, 5-gas heating heat exchange tube, 501-main heat exchange tube, 502-secondary circulation heat exchange tube, 503-smoke condenser, 6-smoke discharge pipeline, 7-compressor, 8-heat pump heating heat exchanger, 9-evaporator, 10-heat pump heating circulation outlet, 11-heat pump heating circulation return water outlet, 12-smoke diversion chamber, 13-smoke condenser, 14-four-way valve, 15-circulation pump, 16-expansion valve, 17-outer cylinder, 18-installation top cover, 19-closed base, 20-installation frame, 21-horizontal partition, 2101-first partition, 2102-second partition, 2103-third partition, 22-combustion air inlet, 23-heat pump air inlet, 24-load-bearing limit beam, 25-electronic anode, 26-magnesium rod, 27-pressure relief port, 28-drain port, 29-cleaning port, 30-temperature sensor. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] like Figures 1 to 5The dual-energy water heating device shown includes a gas heating system, a heat pump heating system, a water tank 1 and a control system. The water tank 1 in this embodiment is cylindrical, and a cold water inlet 2 and a hot water outlet 3 are provided on the water tank 1. The cold water inlet 2 is connected to a tap water supply pipeline, and the hot water outlet 3 is connected to a hot water water point.

[0055] The gas heating system comprises a combustion unit 4 and a gas heating heat exchange pipe 5, wherein the combustion unit 4 is installed above the water tank 1, the gas heating heat exchange pipe 5 is installed in the water tank 1, and one end of the gas heating heat exchange pipe 5 is connected to the combustion unit 4, and one end of the gas heating heat exchange pipe 5 is connected to a flue gas exhaust pipe 6;

[0056] The heat pump heating system comprises a compressor 7, a heat pump heating heat exchanger 8 and an evaporator 9, wherein the compressor 7, the heat pump heating heat exchanger 8 and the evaporator 9 are sequentially connected in a loop and integratedly installed on the outside of the water tank 1; the water tank 1 is also provided with a heat pump heating circulation water outlet 10 and a heat pump heating circulation water return port 11, and the heat pump heating circulation water outlet 10 and the heat pump heating circulation water return port 11 are respectively connected to the heat exchange circulation interface on the heat pump heating heat exchanger 8;

[0057] Temperature sensors 30 for obtaining the actual water temperature of the upper and lower parts of the water tank 1 are respectively arranged in the upper and lower parts of the water tank 1. The temperature sensor 30 for measuring the water temperature of the upper part of the water tank 1 is an embedded temperature probe, which is installed on the upper end surface of the water tank 1; the temperature sensor 30 for measuring the water temperature of the lower part of the water tank 1 is installed on the side wall of the water tank 1 and close to the cold water inlet 2.

[0058] The dual-energy water heater in this embodiment is provided with a separate gas heating system and a heat pump heating system, and the two heating systems are provided with two independent heat exchange systems according to their different heating principles; among them, since the gas heating system has high instantaneous heating heat and fast heating, the gas heating heat exchange pipe 5 is directly arranged in the water tank 1 to ensure the maximum heat exchange efficiency, which can be used for rapid heating and reheating; the heat pump heating system adopts an external method, and the water in the water tank 1 can circulate through the heat pump heating heat exchanger 8 through the heat pump heating circulation outlet 10 to realize heat pump heat exchange. Since the heat exchange continuity of the heat pump heating system is strong and the heating cost is low, it can be used for heat preservation energy consumption or hot water circulation. The two heating systems do not interfere with each other, and can realize separate heating or combined heating, which is also convenient for the control system to control the operation of the two heating systems; in addition, the use of two sets of heat exchange systems for each heat exchange can not only ensure the long-term operation of the heat exchange system, but also improve the heat exchange efficiency of different heat exchange systems in different heating systems. At the same time, in an emergency, if one of the heating systems fails, the other heating system can still be operated unaffected to perform independent heating work.

[0059] In addition, those skilled in the art should understand that the combustion unit 4 in this embodiment includes a burner, a combustion chamber, a gas pipeline, an air supply pipeline, etc.; more specifically, the burner is installed at the upper end of the gas heating heat exchange tube 5 for ignition and combustion of the gas, the combustion chamber is extended in the gas heating heat exchange tube 5 and connected to the burner to facilitate the propagation of heat generated by combustion, the gas pipeline is connected to the burner to provide the gas required for combustion, and the air supply pipeline is also connected to the burner to provide the oxygen required for combustion; it should be noted that since the combustion unit 4 is not the focus of the present technical solution, and those skilled in the art can easily select and assemble the combustion unit 4 reasonably according to the existing technology, its specific structure and working principle will not be repeated in this embodiment.

[0060] Furthermore, with regard to the gas heating system, the gas heating heat exchange tube 5 in this embodiment includes a vertically arranged main heat exchange tube 501, a secondary circulation heat exchange tube 502 and a flue gas condensation tube 503, a flue gas diversion chamber 12 is arranged above the water tank 1, and a flue gas condensation chamber 13 is arranged below the water tank 3; the upper end of the main heat exchange tube 501 is connected to the combustion unit 4, the lower end of the main heat exchange tube 501 extends to the bottom of the water tank 1 and is connected to the lower end of the secondary circulation heat exchange tube 502, the upper end of the secondary circulation heat exchange tube 502 is connected to the flue gas diversion chamber 12; the two ends of the flue gas condensation tube 503 are respectively connected to the flue gas diversion chamber 12 and the flue gas condensation chamber 13; the lower end of the flue gas condensation chamber 13 is connected to the flue gas exhaust pipe 6.

[0061] The gas heating system 1 in this embodiment adopts an upper combustion method, and its working principle is as follows: the hot flue gas generated by the combustion of the combustion unit 101 first flows from the upper part of the water tank 1 to the bottom of the water tank 1 through the main heat exchange pipe 501, realizing the first heat exchange, and then flows back from the bottom of the water tank 1 to the upper part of the water tank 3 through the secondary circulation heat exchange pipe 502 and enters the flue gas diversion chamber 12, realizing the secondary circulation heat exchange. At this time, the flue gas with residual heat flows from the upper part of the water tank 1 to the lower part of the water tank 1 through the flue gas condensation pipe 503 again and enters the flue gas condensation chamber 13, realizing heat exchange again. Finally, the flue gas that has completed the heat exchange is discharged through the flue gas exhaust pipe 6. The gas heating system can realize three heat exchanges between the combustion heat and the stored water, so that the two can be fully exchanged with each other, which can improve the heat exchange efficiency while reducing the heat loss and reducing the waste of resources.

[0062] In addition, in order to ensure the heat exchange efficiency and uniform heat exchange between the gas heating heat exchange tube 5 and the cold water in the water tank 1, the main heat exchange tube 501 is installed along the axial direction of the water tank 1, and multiple secondary circulation heat exchange tubes 502 and flue gas condensation tubes 503 are provided, and the multiple secondary circulation heat exchange tubes 502 and flue gas condensation tubes 503 are evenly installed around the main heat exchange tube. In this embodiment, four secondary circulation heat exchange tubes 1022 are provided, and eight flue gas condensation tubes 1023 are provided. In order to adapt to the gradual decrease in the heat contained in the combustion flue gas during the three heat exchange processes, the diameters of the main heat exchange tube 501, the secondary circulation heat exchange tube 502, and the flue gas condensation tube 503 are also arranged in a decreasing manner; on the other hand, in order to ensure that the flue gas at the end of heat exchange and the condensed water generated by heat exchange in the flue gas condensation tube 1023 can be discharged faster, the lower end of the flue gas condensation chamber 9 is set to be funnel-shaped.

[0063] It should be noted that in this embodiment, the main heat exchange tube 501, the secondary circulation heat exchange tube 502 and the flue gas condensation tube 503 are all straight tubes, but in more embodiments, while meeting the water storage capacity of the water tank 1 and the combustion efficiency of the combustion unit 4, spiral tubes, S tubes, etc. can also be used to increase the heat exchange area.

[0064] Furthermore, with regard to the heat pump heating system, the medium outlet end of the compressor 7 in this embodiment is connected to the heat pump heating heat exchanger 8 and the evaporator 9 through a four-way valve 14; a circulating pump 15 is provided on the connecting pipe between the heat pump heating heat exchanger 8 and the heat pump heating circulation water outlet 10, and an expansion valve 16 is provided on the connecting pipe between the heat pump heating heat exchanger 8 and the evaporator 9.

[0065] It should be clear that the working medium circulates in the heat pump heating system, and the working medium is in liquid state at room temperature. The heat pump heating system realizes two states of heating and defrosting through the four-way valve 14 .

[0066] More specifically, the heat pump heating heat exchanger 8 in this embodiment adopts a shell-and-tube heat exchanger, which includes an inner tube and an outer tube. The two ends of the inner tube are connected to the heat pump heating cycle water outlet 10 and the heat pump heating cycle return water outlet 11 on the water tank 1 through pipes. The circulating water that needs to be heated flows in the inner tube, and the two ends of the outer tube are connected to the compressor 7 and the evaporator 9 through pipes. The working medium for heat exchange flows in the outer tube. It should be noted that the flow directions in the inner tube and the outer tube are reverse.

[0067] The working principle of the heat pump heating system 1 in this embodiment is as follows: Figure 5The heat pump heating system is in a heating state. When the heat pump heating system is started, the liquid working medium can exchange heat with the outside air when passing through the evaporator 9. The function of the evaporator 9 is that when the outside air flows through the outer surface of the evaporator 9, the heat contained in the air will be absorbed by the evaporator 9, and then the absorbed heat can be transferred to the liquid working medium flowing through the evaporator 9. After absorbing heat, the liquid working medium will be transformed into a gaseous state and then sucked into the compressor 7. The compressor 7 can compress the low-pressure working medium gas into a high-temperature and high-pressure working medium gas and send it to the heat pump Heating heat exchanger 8, at this time, under the driving action of the circulation pump 15, the water in the water tank 1 will also circulate between the water tank 1 and the heat pump heating heat exchanger 8, and the two can exchange heat in the heat pump heating heat exchanger 8, thereby playing the role of hot water, and the working medium gas after heat exchange will be converted into liquid working medium again after the heat is dissipated, and will flow into the evaporator 9 again after throttling and cooling by the expansion valve 16, and the repeated cycle work can continuously "pump" the heat in the outside air into the water in the water tank 1, so that the water temperature in the water tank 1 gradually increases; reference Figure 6 , the heat pump heating system is in a defrosting state, in which the functions of the evaporator 9 and the heat pump heating heat exchanger 8 are swapped, and the high-temperature and high-pressure working fluid gas compressed by the compressor 7 flows directly to the evaporator 9, thereby defrosting the evaporator 9.

[0068] Furthermore, in order to ensure that the dual-energy water heating device in this embodiment can work normally and safely, an electronic anode 25 and a magnesium rod 26 are installed in the water tank 1, and the two can cooperate with each other to eliminate water alkali scale and protect the inner tank; a pressure relief port 27, a drain port 28 and a cleaning port 29 are provided on the water tank 1, and a pressure relief valve is installed at the pressure relief port 27, which automatically opens to relieve pressure when the internal pressure of the water tank 1 is abnormal, and its position is in the upper area of ​​the side wall of the water tank 1; a drain valve is installed at the drain port 28, which can be manually opened to discharge residual water in the water tank 1 when necessary, and its position is in the lower area of ​​the side wall of the water tank 1; a sealing cover is installed at the cleaning port 29, which can be manually opened when necessary to facilitate the cleaning of the inside of the water tank 1, and its position is in the lower area of ​​the side wall of the water tank 1.

[0069] Example 2

[0070] This embodiment is a further supplementary solution to Embodiment 1. In this embodiment, an outer tube 17 is further provided on the outside of the water tank 1. A heat-insulating layer is filled between the outer tube 17 and the water tank 1 to improve the heat-insulating capacity of the water tank 1. In addition, in order to enhance the aesthetics of the device, a mounting top cover 18 is further connected to the upper end of the outer tube 17. The mounting top cover 18 is arranged above the combustion unit 4, and an air supply pipeline of the combustion unit 4 passes through the mounting top cover 18. The mounting top cover 18 is also provided with heat dissipation holes for heat dissipation of the combustion unit 4. A closed base 19 is connected to the bottom of the outer tube 17. A plurality of positioning connecting pieces for positioning installation are arranged on the upper end surface of the closed base 19, which are mainly used to locate the relative installation positions of the water tank 1 and the outer tube 17 to ensure that the two are in a coaxial position, so as to facilitate the uniform filling of the heat-insulating layer in the later stage.

[0071] Furthermore, the compressor 7, the heat pump heating heat exchanger 8 and the evaporator 9 are fixedly attached to the outer wall of the outer cylinder 17 through the mounting frame 20. In the present embodiment, the mounting frame 20 is a rectangular frame structure as a whole, and its upper and lower end surfaces are flush with the upper end surface of the mounting top cover 18 and the lower end surface of the closed base 19 respectively. In addition, the side connected to the outer cylinder 17 is open, and the mounting frame 20 is a cylindrical shape adapted to the water tank 1, and the side connected to the water tank 1 is set to a circular arc shape adapted to the shape of the water tank 1; a plurality of horizontal partitions 21 are arranged at intervals in the upper and lower parts of the mounting frame 20, and the plurality of horizontal partitions 21 form a corresponding multi-layer installation space in the mounting frame 20, and the compressor 7, the heat pump heating heat exchanger 8 and the evaporator 9 are respectively installed in a separate layer of the installation space.

[0072] More specifically, the horizontal partition 21 includes a first partition 2101, a second partition 2102 and a third partition 2103 installed in sequence from top to bottom. The first partition 2101 and the mounting frame 20 form a first installation space for accommodating the air supply pipe end of the combustion unit 4. The position of the first installation space corresponds to the mounting top cover 18. In addition, the heat dissipation holes arranged on the mounting top cover 18 are also covered by the first installation space, and a combustion air inlet 22 is opened on the mounting frame corresponding to the first installation space area, and the combustion air inlet 22 is located on the side panel of the mounting frame 20.

[0073] The first partition 2101, the second partition 2102 and the mounting frame 20 form a second mounting space for accommodating the evaporator 9, and a heat pump air inlet 23 is provided on the mounting frame 20 corresponding to the second mounting space area, the evaporation plate of the evaporator 9 is vertically mounted on the back plate of the mounting frame 20, and a fan mounting port is provided on the back plate of the mounting frame 20 at a position corresponding to the evaporation plate 9, the fan mounting port is used to install the evaporator fan, and the outside air enters the second mounting space through the heat pump air inlet 23, exchanges heat after contacting the evaporation plate, and is then discharged from the second mounting space through the evaporator fan.

[0074] The second partition plate 2102, the third partition plate 2103 and the mounting frame 20 form a third mounting space for accommodating the heat pump heating heat exchanger 8. The heat pump heating heat exchanger 8 is fixedly mounted on the third partition plate 2103 via a heat exchanger base.

[0075] The third partition plate 2103 and the mounting frame 20 form a fourth mounting space for mounting the compressor 7. The compressor 7 is fixedly mounted on the bottom plate of the mounting frame 20 via a compressor base.

[0076] In this embodiment, the compressor 7, the heat pump heating heat exchanger 8 and the evaporator 9 are integrated and assembled by means of a mounting frame, and a plurality of partitions 21 are arranged in the mounting frame 20 to form a corresponding multi-layer mounting space for the separate assembly of each component. This not only achieves the integration and unification of all components in the mounting frame, improves the structural integration of the heat pump heating system, and is conducive to the standardization and productization of the overall dual-energy water heating device, but also the layered installation can realize modular assembly in different installation spaces, which improves the assembly efficiency and is also more convenient for the systematic management and maintenance of each modular component. On the other hand, the heat pump heating system is installed externally on the water tank 1, which makes the overall device more integrated and more beautiful in appearance.

[0077] Furthermore, at least two load-bearing and limiting beams 24 are fixedly mounted on the bottom of the closed base 19 and the mounting frame 20 and are parallel to each other and spaced apart. In the present embodiment, two load-bearing and limiting beams 24 are provided.

[0078] The load-bearing and limiting beam 24 has a linear load-bearing surface, which has a stronger load-bearing capacity than the point-bearing load-bearing of the traditional support base, and is safer and more reliable for large equipment such as the dual-energy water heating device; secondly, the two load-bearing and limiting beams 24 are parallel to each other and arranged at intervals. When the whole machine needs to be transported and transferred, the interval space between the two load-bearing and limiting beams 24 can be used as the insertion space for the forklift fork, and then the forklift machinery can be used to transport and transfer the whole machine. Compared with the traditional lifting and transfer method, it is faster and safer, and less likely to damage the equipment.

[0079] Example 3

[0080] like Figure 8 As shown, this embodiment also provides a dual energy water heater control system for controlling the dual energy water heater, including:

[0081] A control panel, used to receive a desired water temperature Ts and an operation mode selection input by a user, wherein the operation modes include at least a comfort mode, an economic mode and a low-carbon mode;

[0082] The temperature acquisition module is used to respectively acquire the actual temperature Tu of the upper part of the water tank, the actual temperature Td of the lower part of the water tank, the gas heating hysteresis temperature Ta and the heat pump heating hysteresis temperature Tb;

[0083] The controller is connected to the control panel and the temperature acquisition module respectively, and is configured as follows:

[0084] like Fig. 9 As shown, when the user selects the comfort mode with the goal of meeting a large amount of hot water demand, the controller continuously obtains the temperature data transmitted by the temperature acquisition module; when Td≤Ts-Tb, the controller controls the heat pump heating system to start for water tank heating until Td≥Ts, at which time the controller controls the heat pump heating system to shut down and continues to obtain the temperature data; when Tu≤Ts-Ta, the controller controls the gas heating system to start for water tank heating until Tu≥Ts, at which time the controller controls the gas heating system to shut down and continues to obtain the temperature data.

[0085] In this embodiment, the start-up condition of the heat pump heating system is that the temperature of the lower part of the water tank decreases. At this time, although the temperature of the lower part of the water tank decreases, there is still sufficient hot water stored in the water tank. The heat pump heating system will intervene at this time, and by slowly heating the water in the entire water tank, efficient energy utilization is achieved, ensuring that energy is saved to the maximum extent while meeting the instantaneous large-scale water demand. The start-up condition of the gas heating system is that the temperature of the upper part of the water tank decreases. At this time, the hot water in the water tank is about to be consumed, and the gas heating system will intervene quickly. The gas heating system has the characteristics of rapid heating. It will immediately heat the water in the upper part of the water tank to ensure that users can still get enough hot water supply when the demand for hot water is large.

[0086] In this mode, the present invention takes meeting the user's large demand for hot water as the primary premise, while fully considering the heating characteristics of the heat pump heating system and the gas heating system and the changing characteristics of the water temperature in the water tank. Specifically, although the heat pump heating system has a high energy utilization efficiency, its power is relatively low, so it has certain limitations in terms of rapid heat replenishment and cannot meet the user's instantaneous demand for a large amount of hot water in a short time. Therefore, the heat pump heating system is mainly used as the main heating method in a non-water use state or a small amount of water use state. Through a long period of slow heating, the water temperature in the water tank is kept stable to achieve energy-saving effects.

[0087] On the other hand, the gas heating system has the characteristic of rapid heating, which can quickly raise the water temperature when users need a large amount of hot water. However, the heating characteristics of the gas heating system determine that it cannot effectively heat the water in the entire water tank, which easily leads to obvious stratification of hot and cold water in the water tank. When users use hot water, the water temperature changes relatively quickly, and the working time of the gas heating system is extended, and it will continuously emit carbon dioxide (CO2), which is relatively not environmentally friendly. Despite this, the gas heating system can provide sufficient hot water supply when users use a large amount of water instantly, making up for the shortcomings of the heat pump heating system.

[0088] This mode cleverly combines the advantages of the heat pump heating system and the gas heating system to achieve a balance between energy efficiency and performance. Under normal circumstances, the heat pump heating system operates as a normal heating mode to maintain the basic water temperature in the water tank. When the user needs a large amount of hot water, the gas heating system quickly intervenes to provide rapid heat replenishment to meet the high-demand hot water usage scenarios. It is worth noting that in this mode, the control processes of the heat pump heating system and the gas heating system are independent of each other, that is, the start and stop operations of one will not directly affect the start and stop of the other. This design ensures that the two systems can operate flexibly and efficiently, each playing to its own advantages, while avoiding interference between systems and achieving a stable and reliable hot water supply.

[0089] In some preferred embodiments, in order to ensure the normal operation of the dual energy water heater, a fault detection mechanism is also provided. Specifically, in the process of the heat pump heating system or the gas heating system heating the water tank, the heat pump heating system or the gas heating system is continuously detected to see if there is a fault. If so, the heat pump heating system or the gas heating system is shut down and an alarm is given to the user. In other preferred embodiments, before the dual energy water heater is powered on and starts to enter the working state, the system can also set a corresponding fault detection or elimination mechanism to ensure that the system is in a normal working state when it is started. This type of fault detection and elimination mechanism is a conventional technology in the art, and the present invention does not further limit this. Obviously, in a dual energy system, if any heating system fails, in addition to shutting down the corresponding faulty system and giving an alarm, the system will automatically switch to another heating system that is operating normally to ensure the continuity and stability of the hot water supply. This design not only improves the reliability of the system, but also avoids the situation where the hot water supply is interrupted due to a single system failure, providing users with a safer and more stable use experience.

[0090] It should be noted that the comfort mode described in this embodiment constitutes the underlying control logic of the present invention, which serves as the basic operating framework of the system. On this basis, the control logic under different subsequent working modes (such as economic mode and low-carbon mode) is a supplement and extension of the underlying control logic. These supplementary logics are adjusted according to specific user needs and external conditions (such as electricity prices, gas prices, ambient temperature, etc.) to achieve more optimized energy management and cost control.

[0091] Therefore, the system is always based on the control logic of the comfort mode. When the user needs to meet a large amount of instantaneous hot water demand, the system will operate according to the control logic of the comfort mode. In other cases (such as non-water use or small water use), the system will select the corresponding control strategy according to the setting of the current mode, so as to provide the best hot water supply solution in different usage scenarios. Through this hierarchical control logic, the present invention ensures the organic unity of flexibility, efficiency and user experience.

[0092] Example 4

[0093] This embodiment is developed on the basis of the above-mentioned embodiment 3. Fig.10 As shown, this embodiment provides a dual-energy water heater control method in an economic mode with the goal of minimizing energy costs and meeting basic hot water needs. At this time, the dual-energy water heater control system also includes:

[0094] The economic parameter acquisition module is connected to the controller and is used to obtain the unit price of electricity C1, the unit price of natural gas C2 and the current ambient temperature T1 in the current period, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system; wherein the performance information of the heat pump heating system is a basic parameter fixed when the dual energy water heater is shipped, which is generally presented in the form of a COP curve. Similarly, the thermal efficiency η of the gas heating system is also a fixed parameter of the dual energy water heater when it is shipped.

[0095] The controller is also configured to select the economic mode when the user aims to minimize energy costs and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×C1 / C2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2.

[0096] The following is an explanation of the thinking process of the calculation formula proposed in this embodiment:

[0097] The core goal of this model is to select the most suitable heating system for use based on the current electricity price, gas price and operating conditions to minimize energy consumption costs. To this end, it is necessary to find the critical condition where the cost is equal when using only the heat pump heating system and only the gas heating system. Specifically, by calculating the COP value (energy efficiency ratio) of the heat pump heating system, it can be determined under what circumstances the cost of using the two heating systems is the same, that is: C1 / COP 热目 =C2 / (α×η); After mathematical transformation, the target COP of the heat pump heating system is obtained 热目 Calculation formula. Those skilled in the art will know that the calorific value of natural gas per cubic meter is generally between 8000 kcal and 8500 kcal, and 1 kcal is equal to 4.1868 kJ. Therefore, the calorific value of natural gas per cubic meter is between 33494.4 kJ and 35587.8 kJ. The calorific value of 1 kWh is 850 kilocalories, which is equivalent to 3.6×10^3 kJ. Therefore, the heat energy generated by the combustion of each cubic meter of natural gas is equivalent to the heat energy generated by 9.3 to 9.88 kWh. Therefore, α can be taken between 9.3 and 9.88, and preferably, the middle value of 9.6 can be taken.

[0098] When T1>T2 when the economic mode is started, the controller controls the heat pump heating system to start water tank heating until T1≤T2-β, the controller controls the heat pump heating system to shut down and controls the gas heating system to start water tank heating until T1>T2, and this step is repeated; wherein β is the ambient temperature adjustment parameter; it should be understood that the switching conditions of the heat pump heating system and the gas heating system in the subsequent time are set to a certain temperature hysteresis to avoid the possibility of frequent switching of the dual system heat sources due to changes in ambient temperature, thereby ensuring that the entire dual energy water heating device can operate stably. β defaults to 2. If the temperature at the installation location of the dual energy water heating device changes rapidly, the β value can be appropriately increased.

[0099] When the economic mode is started, T1≤T2, the actual COP value of the heat pump heating system during operation is lower than the COP 热目 At this time, the cost of using a heat pump heating system for heating is higher than that of using a gas heating system. Therefore, the gas heating system should be used to heat the water tank first until T1≥T2+β, then the gas heating system is turned off and the heat pump heating system is started to heat the water tank until T1≤T2, and this step is repeated.

[0100] The following is a further explanation using an actual case.

[0101] Commercial electricity in a certain place is 0.86 yuan / kW.h, and commercial gas is 3.23 yuan / m 3 , the thermal efficiency of the gas engine is 105%, α is 9.6, and the COP can be calculated: 热目 =9.6*105%*0.86 / 3.23≈2.7, Fig.12 According to the heat pump performance curve shown in the figure, the corresponding target ambient temperature is about 4°C. This means that when the ambient temperature is higher than 4°C, the actual COP value of the heat pump heating system is usually higher than 2.7. Therefore, the heat pump heating system should be used to heat the water tank to achieve higher energy efficiency and cost savings. On the contrary, when the ambient temperature is lower than 4°C, the actual COP value of the heat pump heating system may be lower than 2.7. At this time, the gas heating system should be switched to for heating. In this case, the gas heating system can provide a more stable and efficient heating effect, ensuring that the user's hot water needs are met in a timely manner.

[0102] It should be understood that the above control logic is applicable to heating control in a non-water state or a small amount of water state. When the system is in these states, based on the ambient temperature and the actual COP value of the heat pump heating system, the system will automatically switch between the heat pump heating system and the gas heating system to maximize energy efficiency. However, when the user needs a larger instantaneous hot water supply, the system should automatically switch to the conventional control method provided in Example 1. In this case, the gas heating system will be started first to ensure that the user's hot water demand can be met in a timely manner, while the heat pump heating system continues to serve as an auxiliary heating method to ensure a continuous and sufficient supply of hot water.

[0103] Example 5

[0104] This embodiment is developed on the basis of the above-mentioned embodiment 3. Fig.11 As shown, this embodiment provides a dual-energy water heater control method in a low-carbon mode with the goal of minimizing carbon emissions and meeting basic hot water needs. At this time, the dual-energy water heater control system also includes:

[0105] The economic parameter acquisition module is connected to the controller and is used to obtain the electricity carbon emission factor P1, natural gas carbon emission factor P2 and current ambient temperature T1, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system; wherein the electricity carbon emission factor P1 is determined according to the local electricity source and can generally be automatically obtained through networking or manually input. The natural gas carbon emission factor P2 represents 1m 3 According to existing technology, the CO2 emission after natural gas combustion is 1.9 kg / m 3 , technicians in this field can make manual corrections based on this.

[0106] The controller is also configured to select the low carbon mode when the user aims to minimize carbon emissions and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×P1 / P2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2.

[0107] The following is an explanation of the thinking process of the calculation formula proposed in this embodiment:

[0108] The core goal of this model is to select the most suitable heating system for use based on the local electricity carbon emission factor and operating conditions to minimize carbon emissions. To this end, it is necessary to find the critical condition where the carbon emissions are equal when only the heat pump heating system is used and when only the gas heating system is used. Specifically, P1 / COP 热目 =P2 / (α×η); After mathematical transformation, the target COP of the heat pump heating system is obtained 热目 The calculation formula for .

[0109] When T1>T2 when the low carbon mode is started, the actual COP value of the heat pump heating system during operation is higher than the COP 热目 At this time, the carbon emission of using the heat pump heating system for heating is lower than that of using the gas heating system. Therefore, the heat pump heating system should be used to heat the water tank first until T1≤T2-β, then the heat pump heating system is turned off and the gas heating system is started to heat the water tank until T1>T2, and this step is repeated; where β is the ambient temperature adjustment parameter;

[0110] When T1≤T2 when the low carbon mode is started, the actual COP value of the heat pump heating system during operation is lower than the COP 热目 At this time, the carbon emissions from using a heat pump heating system are higher than those from using a gas heating system. Therefore, the gas heating system should be used to heat the water tank until T1 ≥ T2 + β. Then, the gas heating system is turned off and the heat pump heating system is started to heat the water tank until T1 ≤ T2. This step is repeated.

[0111] The following is a further explanation using an actual case.

[0112] The carbon emission factor of electricity in a certain place is 0.45kgCO2 / kWh, and the carbon emission of natural gas is 1.9kgCO2 / m 3 , the thermal efficiency of the gas engine is 105%, α is 9.6, and the COP can be calculated: 热目 =9.6*105%*0.45 / 1.9≈2.4, Fig.12 The heat pump performance curve shown in the figure shows that the corresponding target ambient temperature is about 2°C. This means that when the ambient temperature is higher than 2°C, the actual COP value of the heat pump heating system is usually higher than 2.4. Therefore, the heat pump heating system should be used to heat the water tank to achieve higher energy efficiency and reduce carbon emissions. On the contrary, when the ambient temperature is lower than 2°C, the actual COP value of the heat pump heating system may be lower than 2.4. At this time, the gas heating system should be switched to for heating. In this case, the gas heating system can provide a more stable and efficient heating effect, ensuring that the user's hot water needs are met in a timely manner.

[0113] It should be understood that the above control logic is applicable to heating control in a non-water state or a small amount of water state. When the system is in these states, based on the ambient temperature and the actual COP value of the heat pump heating system, the system will automatically switch between the heat pump heating system and the gas heating system to achieve the lowest carbon emissions. However, when the user requires a larger instantaneous hot water supply, the system should automatically switch to the conventional control method provided in Example 1. In this case, the gas heating system will be started first to ensure that the user's hot water demand can be met in a timely manner, while the heat pump heating system continues to serve as an auxiliary heating method to ensure a continuous and sufficient supply of hot water.

[0114] Example 6

[0115] This embodiment is developed on the basis of the above-mentioned embodiment 4 or 5. Considering that in the above-mentioned economic mode or low-carbon mode, when the ambient temperature is low, the water temperature in the water tank may drop more than the heating capacity of the heat pump heating system. At this time, the water temperature in the water tank will inevitably continue to drop or even be far lower than the user's expected water temperature. Even if the gas heating system is used for heating, the water temperature will rise slowly or fluctuate greatly, thereby affecting the user experience or even damaging the dual-energy water heater. Therefore, it is necessary to set a forced pre-start and close mechanism for the gas heating system. Specifically, it includes:

[0116] The controller has built-in gas heating system start-up temperature Tc and gas heating system shut-down temperature Te. When T1>T2 and Tu≤Tc, the controller controls the gas heating system to start water tank heating until Tu≥Te; wherein 30℃≤Tc≤55℃, 35℃≤Te≤60℃, Te>Tc.

[0117] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual energy water heater, comprising a gas heating system, a heat pump heating system, and a water tank (1), wherein the water tank (1) is provided with a cold water inlet (2) and a hot water outlet (3), characterized in that: The gas heating system comprises a combustion unit (4) and a gas heating heat exchange pipe (5), wherein the combustion unit (4) is installed above the water tank (1), the gas heating heat exchange pipe (5) is installed in the water tank (1), and one end of the gas heating heat exchange pipe (5) is connected to the combustion unit (4), and one end of the gas heating heat exchange pipe (5) is connected to a flue gas exhaust pipe (6); The heat pump heating system comprises a compressor (7), a heat pump heating heat exchanger (8) and an evaporator (9), wherein the compressor (7), the heat pump heating heat exchanger (8) and the evaporator (9) are cyclically connected in sequence and are integrally installed on the outside of the water tank (1); The water tank (1) is provided with a heat pump heating circulation water outlet (10) and a heat pump heating circulation water return port (11), and the heat pump heating circulation water outlet (10) and the heat pump heating circulation water return port (11) are respectively connected to the heat exchange circulation interface on the heat pump heating heat exchanger (8); and temperature sensors (30) for obtaining the actual water temperature of the upper and lower parts of the water tank (1) are respectively provided at the upper and lower parts of the water tank (1).

2. The dual energy water heater according to claim 1, characterized in that: The gas heating heat exchange pipe (5) comprises a main heat exchange pipe (501) arranged vertically, a secondary circulation heat exchange pipe (502) and a flue gas condensation pipe (503); a flue gas diversion chamber (12) is arranged above the water tank (1), and a flue gas condensation chamber (13) is arranged below the water tank (3); the upper end of the main heat exchange pipe (501) is connected to the combustion unit (4), the lower end of the main heat exchange pipe (501) extends to the bottom of the water tank (1) and is connected to the lower end of the secondary circulation heat exchange pipe (502); the upper end of the secondary circulation heat exchange pipe (502) is connected to the flue gas diversion chamber (12); the two ends of the flue gas condensation pipe (503) are respectively connected to the flue gas diversion chamber (12) and the flue gas condensation chamber (13); the lower end of the flue gas condensation chamber (13) is connected to the flue gas exhaust pipe (6).

3. The dual energy water heater according to claim 1, characterized in that: The medium outlet end of the compressor (7) is connected to the heat pump heating heat exchanger (8) and the evaporator (9) via a four-way valve (14); a circulation pump (15) is provided on the connecting pipe between the heat pump heating heat exchanger (8) and the heat pump heating circulation water outlet (10), and an expansion valve (16) is provided on the connecting pipe between the heat pump heating heat exchanger (8) and the evaporator (9).

4. The dual energy water heater according to claim 1, characterized in that: The water tank (1) is also provided with an outer cylinder (17) on the outside, the upper end of the outer cylinder (17) is connected to a mounting top cover (18), the mounting top cover (18) is arranged above the combustion unit (4), and the air supply pipeline of the combustion unit (4) passes through the mounting top cover (18); the mounting top cover (18) is also provided with heat dissipation holes for heat dissipation of the combustion unit (4); the bottom of the outer cylinder (17) is connected to a closed base (19).

5. The dual energy water heater according to claim 4, characterized in that: The compressor (7), the heat pump heating heat exchanger (8) and the evaporator (9) are fixedly attached to the outer wall of the outer cylinder (17) via a mounting frame (20), and the side of the mounting frame (20) connected to the outer cylinder (17) is open; a plurality of horizontal partitions (21) are arranged at intervals up and down in the mounting frame (20), and the plurality of horizontal partitions (21) form a plurality of layers of installation spaces in the mounting frame (20), and the compressor (7), the heat pump heating heat exchanger (8) and the evaporator (9) are respectively installed in a single layer of installation space.

6. The dual energy water heater according to claim 5, characterized in that: The horizontal partition (21) comprises a first partition (2101), a second partition (2102) and a third partition (2103) which are sequentially installed from top to bottom, the first partition (2101) and the mounting frame (20) forming a first installation space for accommodating an air supply pipeline end of the combustion unit (4), the position of the first installation space corresponds to the mounting top cover (18), and a combustion air inlet (22) is opened on the mounting frame (20) corresponding to the first installation space area; the first partition (2101) The second partition plate (2102) and the mounting frame (20) form a second installation space for accommodating the evaporator (9), and a heat pump air inlet (23) is opened on the mounting frame (20) corresponding to the second installation space area; the second partition plate (2102), the third partition plate (2103) and the mounting frame (20) form a third installation space for accommodating the heat pump heating heat exchanger (8); the third partition plate (2103) and the mounting frame (20) form a fourth installation space for installing the compressor (7).

7. The dual energy water heater according to claim 5, characterized in that: The lower end surface of the closed base (19) is flush with the lower end surface of the mounting frame (20), and at least two mutually parallel and spaced load-bearing limit beams (24) are fixedly mounted at the bottom of the closed base (19) and the mounting frame (20).

8. A dual energy water heater control system for controlling the dual energy water heater according to any one of claims 1 to 7, characterized in that: include: A control panel, used to receive a desired water temperature Ts and an operation mode selection input by a user, wherein the operation modes include at least a comfort mode, an economic mode and a low-carbon mode; The temperature acquisition module is used to respectively acquire the actual temperature Tu of the upper part of the water tank, the actual temperature Td of the lower part of the water tank, the gas heating hysteresis temperature Ta and the heat pump heating hysteresis temperature Tb; The controller is connected to the control panel, the temperature acquisition module, the gas heating system and the heat pump heating system respectively, and is configured as follows: When the user selects the comfort mode with the goal of meeting a large demand for hot water, the controller continuously acquires the temperature data transmitted by the temperature acquisition module; when Td≤Ts-Tb, the controller controls the heat pump heating system to start heating the water tank until Td≥Ts, at which time the controller controls the heat pump heating system to shut down and continues to acquire the temperature data; when Tu≤Ts-Ta, the controller controls the gas heating system to start heating the water tank until Tu≥Ts, at which time the controller controls the gas heating system to shut down and continues to acquire the temperature data.

9. The dual energy water heater control system according to claim 8, characterized in that: include: It also includes an economic parameter acquisition module, which is connected to the controller and is used to obtain the unit price of electricity C1, the unit price of natural gas C2 and the current ambient temperature T1 of the current period, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system; The controller is also configured to select the economic mode when the user aims to minimize energy costs and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×C1 / C2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2; When T1>T2 when the economic mode is started, the controller controls the heat pump heating system to start water tank heating, until T1≤T2-β, the controller controls the heat pump heating system to shut down and controls the gas heating system to start water tank heating, until T1>T2, and this step is repeated; wherein β is the ambient temperature adjustment parameter; when T1≤T2 when the economic mode is started, the controller controls the gas heating system to start water tank heating, until T1≥T2+β, the controller controls the gas heating system to shut down and controls the heat pump heating system to start water tank heating, until T1≤T2, and this step is repeated.

10. The dual energy water heater control system according to claim 8, characterized in that: It also includes an economic parameter acquisition module, which is connected to the controller and is used to obtain the carbon emission factor P1 of electricity, the carbon emission factor P2 of natural gas and the current ambient temperature T1, and query the performance information of the heat pump heating system and the thermal efficiency η of the gas heating system; The controller is also configured to select the low carbon mode when the user aims to minimize carbon emissions and meet basic hot water needs. The controller has a built-in heat pump heating system target COP. 热目 Calculation formula: COP 热目 =α×η×P1 / P2; where α is a dimensionless parameter, representing the calorific value of each cubic meter of natural gas combustion and the amount of electricity consumed by the heat pump heating system to produce equivalent calorific value; the controller obtains various parameters to calculate the target COP of the heat pump heating system 热目 , and query the COP in the heat pump heating system performance information 热目 The corresponding target ambient temperature T2; When T1>T2 when the low-carbon mode is started, the controller controls the heat pump heating system to start water tank heating, until T1≤T2-β, the controller controls the heat pump heating system to shut down and controls the gas heating system to start water tank heating, until T1>T2, and this step is repeated; wherein β is the ambient temperature adjustment parameter; when T1≤T2 when the low-carbon mode is started, the controller controls the gas heating system to start water tank heating, until T1≥T2+β, the controller controls the gas heating system to shut down and controls the heat pump heating system to start water tank heating, until T1≤T2, and this step is repeated.

11. The dual energy water heater control system according to claim 8, characterized in that: It also includes a fault detection module, which is configured to continuously detect whether there is a fault in the heat pump heating system or the gas heating system during the process of the heat pump heating system or the gas heating system heating the water tank. If so, a shutdown command is sent to the controller to shut down the heat pump heating system or the gas heating system, and an alarm is given to the user.

12. The dual-energy water heater control system according to claim 9 or 10, wherein the controller has a built-in gas heating system start-up temperature Tc and a gas heating system shut-down temperature Te, and when T1>T2 and Tu≤Tc, the controller controls the gas heating system to start water tank heating until Tu≥Te; wherein 30℃≤Tc≤55℃, 35℃≤Te≤60℃, Te>Tc.

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